Hi

I’m having some problems with the formatter of ticks in a polar plot.

Below is a minimum example

The first figure is correct, the second has wrong ticks.

This has be tested both on 1.2.0 and the latest from git (1.4.x, commit 64cc3416396ffb2811af80fc810ed63572df71d9 )

Does anyone know whys this happens?

Is it a bug in MaxNLocator

Kind regards

Pål

## ···

#!/usr/bin/env python

import numpy as np

import matplotlib.pyplot as plt

from matplotlib.ticker import MaxNLocator

# Data

M=np.sin(np.meshgrid(np.arange(30),np.arange(30)))

M=np.squeeze(M[0,:,:])

Radius=np.arange(30)

Theta=np.arange(30)

# Plotting the correct figure

print(‘Correct ticks’)

fig=plt.figure()

ax1 = fig.add_axes([0,0,0.8,1],projection=‘polar’)

c = ax1.pcolormesh(Theta, Radius, M)

ax1.set_frame_on(False)

plt.xticks([])

plt.yticks([])

ax2=fig.add_axes([0.9,0.1,0.05,0.7])

cb=fig.colorbar(c,cax=ax2)

plt.show()

# Doing the same plot

print(‘Wrong ticks by using formatter’)

fig=plt.figure()

ax1 = fig.add_axes([0,0,0.8,1],projection=‘polar’)

c = ax1.pcolormesh(Theta, Radius, M)

ax1.set_frame_on(False)

plt.xticks([])

plt.yticks([])

ax2=fig.add_axes([0.9,0.1,0.05,0.7])

cb=fig.colorbar(c,cax=ax2)